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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 20, 2018
Income Tax Disclosures [Line Items] |  |  |  |  |  |
One-time Transition Tax Rate | $ (146) |  | $ (93) | $ (509) | $ (246) |
Gain (Loss) on Disposition of Business | $ 21 |  | $ 1 | $ (856) | $ 49 |
Effective Income Tax Rate Reconciliation, Percent | 44.00% |  | 31.00% | 30.00% | 36.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 21.00% | 35.00% |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 1,796 | $ 39 |
Electrica Santiago (Gener ESSA) [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | (69) |  |
Tax on gain (loss) on disposition of business |  | $ 25 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | 287 |  |
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | (773) |  |
Tax on gain (loss) on disposition of business |  |  |  | 155 |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | 1,050 |  |
Argentina [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Income Tax Expense (Benefit), due to Foreign Currency Exposure | $ 16 |  | $ 4 | 38 | $ 8 |
Masinloc Subsidiary [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 51.00%
UNITED STATES |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
One-time Transition Tax Rate |  |  |  | (708) |  |
Change in Accounting Estimate, Type [Domain] | UNITED STATES |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
One-time Transition Tax Rate |  |  |  | $ (33) |  |

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